Stoker construction



Aug. 27, 1929. o. ARAM STOKER CONSTRUCTION ori iiml Filed Sept. 17, 1920 2 Sheets-Sheet INVENTQIR OTTO ARAM.

mam

ATTORNEY a I "Milan/"1114 I Ill-l.

Aug.27, 1929. QAR M Re. 17,416

, STOKER cons rmgcnou 7 Original Filed Sept. 17, 1920 2 Sheets-Sheet 2 lNVEN-TOR.

OTTOARAM. -BY.'

uM gIM ATTORNEY 'Reissued Aug. 27, 1929.

UNITED STA TES PATENT" OFFICE.

OTTO ABAM, OF ALIJENTOWN, IPENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC- TRIO AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

STOKEB CONSTRUCTION.

Original No. 1,558,215, dated October 20, 1925, Serial No. 410,865, filed September 17, 1920. Application for reissue filed July 10, 1929. Serial No. 377,304.

This invention relates to the mechanical the underfeed type wherein rows of tuyeres y and fuel-feeding retorts are. alternately arranged in parallel relation and inclined from the front wall of the furnace to the dump grate.

An objectof the invention is to provide a grate surface composed of parts of simple and durable construction which may be readily assembled or replaced without materially disturbing other parts of the grate.

Anotherobject is to provide retorts constructed of fabricated frames upon which detachable side and bottom plates are mounted, thereby obtaining the advantage of the superior strength and durability of structural iron frames over the usual cast iron retorts which tend to warp and crack under the weight and heat of the tuyeres and fuel bed usually supported by the retorts. By making the side and bottom walls detachable and sectional, they may be removed in case of failure without disturbing the tuyeres or necessitating the removal of the retorts.

Another object is to provide aretort construction which securely ties the rear grate support or dump grate supporting casting to the upper casting usually disposed beneath the front wall of the furnace. The lateral strains imposed upon the dump grate casting and support are quite severe and frequently cause failure of the cast iron retort frames usually employed which are subjected to uneven temperatures and rapid temperature variations and are taxed to their full ca- Fig.3 a section similar to that of Fig. 2 showing a modified retort construction;

Fig. 4: is a side elevation showing the sup-' porting members and side wall plates;

gig. 5 is a section on line VV of Fig. 4-; an

Fig. 6 is a section on line VIVI ofFig. 4.

Referring to the drawings, the stoker includes a fuel feeding hopper 5 which may be of any preferred construction. The discharge channel 6 of the hopper extends beneath the front wall 7 ofthe furnace, and fuel is forced through the channel by means of a reciprocating plunger 8 which may be operated in any desired manner. A casting 9 which extends entirely across the width of the f-urnaceserves to support and connect the fuel retorts which are arranged in spaced parallel relation across the width of the furnace. The hopper castings 5 are bolted or otherwise secured to the front casting 9, and the hoppers and front casting are supported upon an I-beam 11 which is mounted upon any suitable foundation such as that indicated at 12.

Spaced from the front support and extending across the furnace is a rear grate support. casting 13 mounted upon structural frames 14 which may be mounted directly upon the foundations beneath the casting or supported by the side walls of the furnace. The rear casting 13 and the front casting 9 are connected at spaced intervals by means of frames fabricated from commercial shapes.

In the construction illustrated in Figure 2,. each frame includes an upper tie member 15 and a lower tie member 16 formed of angle iron. The ends of the tie members are bolted securely to the castings 13 and 9 and form a connection, therefor, which may expand and contract with variations in temperature without danger of failure. Side plates 17, which are formed in sections and which may be made either of cast or plate iron, are bolted to the upper and lower tie members and form the side walls of the retorts. tom plates 18 are placed across the space between the two adjacent frames and rest upon the tie members-16 to which they are bolted.

The side and bottom plates form a retort which extends from the discharge channel of Sectional botthe hopper to a point above the casting 13. The casting 13 is so formed that acontinuation of the retort bottom extends to the lowerend of the grate to be hereinafter described.

Rows of tuyeres 19 are mounted upon the lustratedwherein the tuyeres 19 rest directly upon the angle iron It will be seen that the plates 17 may be replaced without disturbing the tuyeres.

The tuyeres 19 extend jacentthe front wall of the furnace tothe lower end of the grate and overlap. a dump grate 21 which extends entirely across the width of the grate and is pivoted to-the cast u bustlon grate formed of alternately disposed ing 13 at 22. v

ondary or auxiliary ram 26 which reciprocates in the lower end of the retort adjacent the lower tuyeres 19 and which agitates the fuel in the lower portion of the grate. The

525' ram is connected to a driving means, not shown, by means of a connecting rod 27 which extends forwardly and projects through an upper casting. I

While I have shown my invention in but one form, it will be obvious to those skilled in the art that itis not so limited, but is susceptible of Various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such l1 m1- tations shall be placed'thereupon as arevlmposed by the prior art or asare specifically set forth in the appended claims.

What I claim is 1. An underfeed stoker construction comprising "a plurality of retorts arranged in spaced parallel relation, each comprising upper and lower pairs 'of structural frame members, detachable side plates secured to each upper. frame member. and cooperating with the corresponding lowerframe member and detachable bottom plates connecting the lower frame members, the said plates forming side and bottom walls respectively of the retorts, and grate tuyres' mounted on adjacent upper frame members of the retorts and.

bridging the spacebetween the retorts.

2. In an underfeed stoker having a combustion grate formed .of alternately disposed tuyeres and retorts, front and rear supports for the grate, a plurality of tie members extending between and connected to said supports, plates forming the side and bottom walls of said retorts secured to said tie mem-' bers, and tuyeres bridging'the spaces between and supported upon said retorts..

I 3. In an underfeed stoker having a com forthe grate, a plurality of tie members extending between and connected to said supfrom a point ad-- Each retort maybe provided with a sec r for the grate, a plurahty of pal-rs of upper members of the retorts spacebetween them.

bustion grate'formed of alternately disposed tuyeres and retorts, front and rear supports.

ports, and so disposed relatively to each other" as to-determine the cross sectional dimensions and spacing of said retorts, plates secured' 'tuyeresandretorts, front and rear supports for the grate, an upper series of tie members and a corresponding lower series of tie members extending between and connected to said supports, plates secured to tie members to form side and bottom walls of spaced retorts and tuyeres bridging the spaces between and supported upon said retorts.

5. In an underfeed stoker having a comtuyeres and retorts, front and rear supports tie members and'a plurality ofcorresponding pairs of lower tie members extending between and connected to said supports, plates secured to each'upper and corresponding lower tie member to form side walls and plates secured to the lower tie members to tuyeres extendinglongitudinally of the furnaceand retorts between said rows'of tuyeres,

a unit retort for said stoker'comprising a plurality. of pairs oflongitudinally extend- I .ing tie members, andv detachable plates secured to said tie members to form side and bottom wallsof the retorts.

7. In an underfeed stoker having acombustion grate formed' of spaced rows of tuyeresextending longitudinally of the furnace and retorts between said rows of tuyeres, a unit retort for said stoker comprising a pair of upper and a pair of lower. longitudinal ly extending tie members, and platesse-.

cured on said tie members to form side and bottom walls of the retort.

8. An underfeed stoker construction comprising a plurality of retorts arranged in spaced parallel relation, each -comprising upper and lower pairs of structural frame members, detachablesectional side plates secured between each upper and'the corresponding lower member and detachable secs tional bottom plates connecting the "lower frame members, the said plates forming side and bottom wallsre'spectively of said retorts and tuyeres mountedon adjacent upper frame and bridging the 9. In a downwardly inclined-stoker of the type havingalternatelyarranged retorts and tuyere rows, the combination of transverselydisposed front and rear supporting structjures; a plurality of spaced, longitudinallyarranged substantially parallel beam members extending from the front to the rear supporting structure and carried at their ends y by said structures; a plurality of upright plates detachably secured to each of the beam meinbers to form sectional retort side walls; bottom-forming members disposed between alternate adjacent retort side walls; and tuyere plates bridging the space between and supported by the side Walls of adjacent retorts to form the tuyere rows.

10. In stoker apparatus, the combination of transversely-disposed front and rear sup porting structures; a plurality of spaced,

longitudinally-extending substantially parallel beam members extending from -the front to the rear supporting structures and carried at their ends by said supporting structures; and a combustion grate compr1s- 'ing alternately-arranged retorts and tuyere rows carried by the beam members; the retorts including sectional side walls formed of plates detachably secured to the beam members; and the tuyere rows being provided by the side walls of adjacent retorts and by tuyere plates bridging the space between and supported by such side walls.

11. In a furnace, the combination of a supporting structure disposed transversely of the furnace and adjacent one wall thereof; a

second supporting structure disposed in spaced relation to the first supporting structure and at a lower level; and a downwardly inclinedstoker extending between and carried by the twosupporting structures and comprising a plurality of spaced substantial 1y parallel beam members carried at their ends by-the supporting structures, a plurality of upright plates detachably securedto OTTO ARAM. 

